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FireBug: Awesome JavaScript Utility

The one problem with Ajax-enabled applications is that it is
difficult to know what is going behind the scenes. It is even more
difficult to know what happened when something goes wrong. Your activity
indicator image keeps spinning, but the nothing seems to happen on the
page. FireBug will help you figure exactly what went wrong and
where.

What Is FireBug?

FireBug is an extension for Firefox 1.5 that was created by Joe
Hewitt and it helps with the debugging of JavaScript and Ajax. FireBug
includes a DOM inspector, a JavaScript console and a command-line
JavaScript interpreter, all in one. We're mostly interested in its
ability to log Ajax requests. The current release of FireBug is 0.3.2.
The 0.4 version is currently in alpha and includes a JavaScript
debugger. The addition of the debugger will make FireBug even more
useful and harder to live without.

Installation

You need Firefox 1.5 to use FireBug. Even if your primary browser
isn't Firefox, it is worthwhile to have Firefox with the FireBug
inspector installed on your machine just for the purpose of debugging.
Installation is very simple. Simply go to http://www.joehewitt.com/software/firebug
and click the large "Install FireBug" button and follow the directions.
After installation you'll need to restart Firefox for the extension to
complete installation.

A Brief Tour

After reopening your browser, you can change FireBug's visibility by using Firefox's view menu bar at the top of the screen, or by ...

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